# std::scoped_lock<MutexTypes...>::scoped_lock

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< cpp‎ | thread‎ | scoped lock

explicit scoped_lock( MutexTypes&... m ); | (1) | (since C++17)
scoped_lock( std::adopt_lock_t, MutexTypes&... m ); | (2) | (since C++17)
scoped_lock( const scoped_lock& ) = delete; | (3) | (since C++17)

Acquires ownership of the given mutexes m.

1) If sizeof...(MutexTypes) == 0, does nothing. Otherwise, if sizeof...(MutexTypes) == 1, effectively calls m.lock(). Otherwise, effectively calls std::lock(m...).
2) Acquires ownership of the mutexes m... without attempting to lock any of them. The behavior is undefined unless the current thread holds a non-shared lock (i.e., a lock acquired by `lock`, `try_lock`, `try_lock_for`, or `try_lock_until`) on each object in m....
3) Copy constructor is deleted.

The behavior is undefined if m is destroyed before the `scoped_lock` object is.

### Parameters

m | - | mutexes to acquire ownership of

### Exceptions

1) Throws any exceptions thrown by m.lock().
2) Throws nothing.

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
P0739R0 | C++17 | `adopt_lock_t` parameter was last, impeding class template argument deduction | moved to first

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